Xiao-Hong Yan1, Jing Wang1, Yu Zhao2. 1. Department of Oto-Rhino-Laryngology, West China Hospital, West China Medical School, Sichuan University, No. 37 Guo Xue Alley, Chengdu, 610041, Sichuan, China. 2. Department of Oto-Rhino-Laryngology, West China Hospital, West China Medical School, Sichuan University, No. 37 Guo Xue Alley, Chengdu, 610041, Sichuan, China. yutzhao@163.com.